Welded joint for steel and iron pipes and tubes.



J. G. STEWART.

WELDED JOINT FOR STEEL AND IRON PIPES AND TUBES. APPLIOATION FILED N0v. 22, 1912.

1,1 03,630, Patented July 14,1914.

Fig.1..

A2257; ZJJST Wz'sws Zc/K zu ran snares FATENT @FFIQE.

JOHN GRAHAM STEWART, OF COATBRIDGE, SCOTLAND, ASSIGNOR T0. STEWARTS &

' LLOYDS, LIMITED, OF COATIBRIDGE, SCOTLAND.

W ELDED JOINT FOR STEEL AND IRON PIPES AND TUBES.

Specification of Letters Patent.

Patented July MC, 1914.

Application filed November 22, 1912. Serial N 0. 732,951.

To all whom it'ma e concern:

Be it known that I, JOHN GRAHAM S'rnw-.

' ART, a subject of the King of Great Britain,

i s, P p

residing at Coatbridge, Laparkshirc, Scotland, have invented certain new and useful Improvements "in Welded Joints for Steel and Iron Pipes and Tubes, of which the following is a specification.

readily under bending strains and strains other mams,

- time, the

the faucet and can arising from expansion and contraction and other causes and, in the case of gas and laid in roadways, also under the stresses produced by the passage over them of heavy motor vehicles. Under my invention I make the joint for the iron .or steel pipes or tubes with a spigot and faucetconnection of sufiicientlength and tightness to prevent transverse strains acting on the weld which latter is effected at the end of be done in a thoroughly reliable manner and without danger to the operator. A space is left between thespigot and faucet and this space is packed, elther wholly or partially with metalturnings, filings or ieces or metal wire or rings, care being ta en that the metal used is of the same nature as that of the pipes'or tubes being jointed. The packing is inserted with sufiicient tightness to form a rigid joint so as to take any transverse strain o the actual weld. The weld is effected at the end of the faucet by simply directing the oxyacetylene or other flame on to the metal turni'ngs, filings, or pieces, as the case may be, so as'to reduce a part or the whole there of to a molten condition and, at thesame faucet andspigot are heated by the flame to a suflicientextent to effect an autogenous weld between-the faucet and the spigot with the aid of the additional metal constituted by the said turning's, filings, or pieces. The oxyacetylene flame is directed parallel or substantially parallel with-the surface ofthe'spigot and into the annular space left} between the spigot and faucet and deb-plays against the; metal packing and the end of the faucet and the adjacent surface of the spigot In order that the invention may be clearly understood I have hereunto appended, simply by way of illustration or example, a drawing which shows, in section, different forms of spigot and faucet joints packed and welded in accordance with my invention.

Figure -1 shows a spigot and faucet joint in which the faucet is made with an enlargeing. Fig. 2 shows a similar with refractory material. Fig. 3 shows a joint in which rings are used as packing.

In Figs. 1 and 2 the faucet a is made with an'enlargement b at its end, a packing space 0 being left between the enlarged part and the spigot 02. The space 0 may, as shown at Fig. 1, be tightly packed with metal turnings, filings, or pieces 6 and, when effecting the weld at the end of the faucet, the exterior portion 1 of the packing is brought to the necessary welding heat by the applica-' tion of an oxy-acetylene or other flame.

In Fig. 2 the space 0 is shown as tightly packed with refractory material 9 the au- 'togenous weld being effected, at the end of the faucet, by the aid of additional metal it of the same nature as the piping. Of course the space a may be merely packed with refractory material at its interior and at its exterior be acked with a suitable metal by the aid of which the autogenous weld can be effected. I V

In Fig, 3 a plain spigot and faucet joint is shown the space 0 between the s igot and faucet being packed with rings 2' al of which may be metal of the same nature as the piping or only the outer one. In t is case the "outer ring serves for the uniti g metal of the autogenous weld. v I

The inventioncan, of course, be applied to any form of spigot and faucet pipejoint wherein a suit'a le space is left or provided for the reception of the packing.

The re-inforcement to the spigot 03 pro vided by the tightly packed faucet a, I), gives suflicient strength to the joint to resist transverse stresses and prevent strains produced thereby acting on the weld which latter insures fluid tightness. By using a ,metallic packing suitable for forming the ment for the reception of the metallic packjoint but packed 7 weld, the latter can be effected without the metal.

Having now fully described my invention what I claim and desire to secure by Letters Patent is p l. A pipe joint comprising, in combination, a metal tube, a second metal tube having an enlarged faucet part surrounding the end of the said first tube and a metal of the same nature as the tubing packed tightly into the annular space between the two tubes and welded at the end of the faucet t0 the adj acent surfaces of the tubes.

2. A pipe joint comprising, in combination, a metal tube, a second metal tube having an enlarged faucet art embracing the end of the said first tu s and metal turnings of the same nature as the tubing packed into the space between the tubes and welded to the adjacent surfaces thereof.

3. A pipe joint comprising, in combination, a metal spigot tube, a second metal tube having a faucet part tightly embracing the end of the said spigot tube said faucet being enlarged at its end and metal packing inserted tightly intothe enlargement, the. end

'tube having a faucet part tightly embracing the end of the said spigot tube said faucet being enlarged at its end, packing of'the same material as the tubes inserted in the enlargement, and a weld connection made between the spigot and faucet with the aid of said packing. f In testimony whereof I aflix my signature in presence of two witnesses.

JOHN GRAHAM STEWART. Witnesses:

WILLIAM GALL, LEO H. FREEMAN. 

